Photogrammetry

We offer over 20 years of experience providing Digital Photogrammetric Services. The bulk of our work is providing historical analyses of changing coastlines. Examples of this work are referenced in our publication list.

Tekmap rectifies the imagery using available ground control data. We choose or eliminate ground control points (GCP) based on careful inspection of the Root Mean Square (RMS) errors. The RMS errors and the data type help determine the best rectification algorithm to use. We aim for the highest possible accuracy in the rectified imagery.

Final Products

A number of products from our Digital Photogrammetry Service are available.

Product

Description

Historical Analyses

Historical analyses of geographic features such as shorelines.

Feature Digitization

Digitization of physical features.

Feature Measurement

Measurements of geographical feature changes over time.

Digital Mosaics

Rectified imageries patched together into a single mosaic.

Data Fusion

Fusion of rectified imagery with other data such as bathymetry or sidescan.

To obtain an estimate or for more information on our Digital Photogrammetric Services, please contact us.

Introduction

The v.mk_circle program is a simple GRASS utility to create a closed vector at a user defined location and size. The program was originally written to create a GRASS vector for target zones at a specific location. The v.mk_circle program has since been upgraded to output other shapes (see below), and accept multiple...